Lap joint



W. KROIER July 11, 1939.

LAP JOINT Filed Sept. 50, 1937 ATTORN EYS Patented July 11, 1939 UNITED STATES PATENT OFFICE 2 Claims.

The invention relates to a lap joint for metal roofing and the method. of making the same.

The primary object of the invention is the provision of a lap joint of this character, where- 5 in the metal roofing in the laying thereof can be lap jointed through nailing and crimping sheets together in a manner that the nails fastening the sheets will be concealed and avoiding the penetration of such nails through that portion of the sheet exposed to the weather elements and in this fashion effecting an anti-siphon, self-draining and blind nailed roofing to an edifice or the like.

Another object of the invention is the provision of a lap joint of this character, wherein the sectional sheathings involving the lap joint are removable and replaceable without'in any way damaging the roofing with resultant leakage therethrough, the joint being effected in a novel manner so that the fasteners securing the sheathing to the roofing of a structure will be devoid of penetrations created by such fasteners, that is, that part of the sheathing exposed to the Weather elements and a firm and secure lap joint is had without liability of the loosening of the sheathing or the roofing coming apart.'

A further object of the invention is the provision of a lap joint of this character, wherein the sheathing sections can be interlocked or interfitted with each other and the fasteners securing such in place are concealed or blinded and the overlap joint effected with dispatch in the laying of the roofing or the separation of the sheathing for the mending of the roofing or the replacing of one section for another.

A still further object of the invention is the provision of a lap joint of this character, wherein a novel method is created in the laying of the sheathing for a roofing and in the lap jointing of the sections.

A still further object of the invention is the provision of a lap joint of this character, which is extremely simple in its construction, thor- 45 oughly reliable and efiicient in operation, assuring a leakproof roof or other covering, strong, durable, assuring the laying of the roofing with dispatch and inexpensive to manufacture and install.

50 With these and other objects in View, the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawing, which discloses 55 the preferred and modified forms of embodiment of the invention and pointed out in the claims hereunto appended.

In the accompanying drawing:

Figure 1 is a fragmentary sectional view taken on the line 22 of Figure 2 looking in the direc- I tion of the arrows.

Figure 2 is a fragmentary top plan view of the lap joint constructed in accordance with the invention.

Figure 3 is a sectional view taken on the line 10 33 of Figure 2 looking in the direction of the arrows.

Figure 4 is a perspective View of a fastener for the lap joint having in association therewith a washer. 16

Figure 5 is a perspective view of a modified form of fastener.

Similar reference characters indicate corresponding parts throughout the several views in the drawing. 20

Referring to the drawing in detail, A designates generally a portion of the bed of a roof of a building or other edifice while B and C, respectively, denote portions of sheathing sections or metal roofing material covering such bed and 25 preferably of sheet metal. These sections B and C in the laying thereof are joined by an overlap joint constituting the present invention and hereinafter fully described.

The overlap joint constituting the present in- 30 vention is formed by distorting, in this instance, the section B lineally next to one longer edge thereof to effect upwardly disposed inverted V-shaped ridges or ribs Ill so that there exists between the same the substantially V-shaped 35 channel or groove ll while the section C is carried over these ribs or ridges ill for a distance and such overhang of said section C has struck upwardly therefrom crownings l2 for the ridges or ribs Ill and these are in parallel spaced relation to each other in conformity with the separation of the ribs or ridges and each is flattened at l3 with a determined width between the side portions M of said crowning which are downwardly divergent and in this manner the ridges or ribs ill in the section B are freely received in the crownings l2 at the overlaps of these sections with respect to each other.

Prior to the crowning of the ridges or ribs ID or the overlapping of the section B by the section C, these ribs or ridges ID at determined points have driven downwardly therethrough flat headed nails I5 which engage in the bed A securing the section B in place thereon, these nails I5 being passed through suitable holes therefor in the ribs or ridges I and carry beneath the flat heads I6 substantially square or rectangular shaped concave-convex washers Il, there being suitable loose play between the lat ter and the shanks or stems of the nails I for slight displacement or for free rotation of the Washers IT! upon the nails.

The nails I5 are driven home sufiiciently to bring the washers I'I thereon close to or in contact with the apexes with the ribs or ridges I0. Thereafter these ridges II] with the nails I 5 passed therethrough are overlapped by the crownings I2 in the section C and by depressing downwardly such crownings I2 the washers H in coaction therewith center the crownings in their interfitted relation to the ridges or ribs I0. Now in the use of a crimping tool, the sides I 4 at the points confronting the nails I5 and the Washers I? can be pried upon by such tool for indenting or inwardly crimping of these sides I4 as at I3, being understood, of course, that precrimping of the crownings I2 can be had before lap jointing the sections B and C together. Thus the ribs or ridges I2 and the crowning I2 through the crimps I8 will be locked together in their interfitted lap jointed relation to each other and in this manner these sections B and C constitute the roofing.

When the crownings I2 are precrimped at I8, the lap jointing of the sections B and C is had by first permanently fixing the section B upon the bed A of the roof and then slidably interlocking the crownings l2 with the washers H, the ribs or ridges I0 and the crownings I2 being disposed from the highest point or ridge of the roof to the lowermost edge thereof. In the creating of the overlap joint as heretofore set forth, the roof will be anti-siphoning, self-draining and blind nailed while the sections 13 and C are removable and replaceable with dispatch and ease.

In Figure 5 of the drawing there is shown a slight modification wherein the nail I9, which may be a substitute for the nail I5, is formed with a relatively large flat head 20 and in this instance the washer H can be dispensed with because this head 20 will interlock with the crownings I2 in association with the crimps I8 in the sides I4 of such crownings as well as the flats I3 of the crownings, being clearly apparent from Figures 1 to 3 inclusive, of the drawing that no holes or openings in the roofing are exposed to weather elements.

By reason of the formation of the overlap joint in the creation of the ridges or ribs I0 and the crownings I2 there is effected barriers due I to spaces existing between said ridges and crownings for the checking of rain subjected to wind current forces to avoid seepage of such rain or the like into the joint to give entrance through the roof proper resultant in leakage therethrough. In other words, the overlap joint constructed as hereinbefore set forth is positively leakproof.

What is claimed is:

1. A lap joint for sheathing comprising sheetlike sections superposed relative to each other at edges adjacent to one another for effecting an overlap therebetween, a crown struck outwardly from the outermost section at the overlap, a ridge struck outwardly from the innermost section at the overlap, a fastener passed through the ridge, and inwardly distorted portions at intervals in the outermost section at the overlap and at the point of said fastener for the locking of the crown and ridge together at the overlap, the fastening of these to a support and also entirely concealing the said fastener.

2. A lap joint for sheathing comprising sheetlike sections superposed relative to each other at edges adjacent to one another for effecting an overlap therebetween, a crown struck outwardly from the outermost section at the overlap, a ridge struck outwardly from the innermost section at the overlap, a fastener passed through the ridge, and inwardly distorted portions at intervals in the outermost section at the overlap and at the point of said fastener for the locking of the crown and ridge together at the overlap, the fastening of these to a support and also entirely concealing the said fastener, the crown being of greater width than the ridge.

WALDEMAR KROIER. 

